FWIW, https://en.cppreference.com/w/cpp/language/bit_field https://en.cppreference.com/w/cpp/language/bit_field doesn’t mention that. It does say bitfields of

FWIW, https://en.cppreference.com/w/cpp/language/bit_field https://en.cppreference.com/w/cpp/language/bit_field doesn’t mention that. It does say bitfields of size zero are allowed (that forces padding to the size of the allocation unit), and also, curiously, says that, in C, “whether int bit-fields that are not explicitly signed or unsigned are signed or unsigned is implementation-defined.”